Modal analysis and cut-off conditions of multichannel surface-acoustic-waveguide structures

Author

Griffel, G. ; Golan, G. ; Ruschin, Shlomo ; Seidman, A. ; Croitoru, Natan

Author_Institution

Dept. of Electron. Devices & Mater. & Electromagn. Radiat., Tel Aviv, Israel

Volume

35

Issue

4

fYear

1988

fDate

7/1/1988 12:00:00 AM

Firstpage

503

Lastpage

510

Abstract

Multichannel guides for surface acoustic waves can improve the efficiency of SAW (surface acoustic-wave) devices significantly. Focusing, steering, and modulating the propagating acoustical modes can be achieved similarly to optical waveguided devices. A general formulation is presented for the analysis of the lateral waveguiding properties of Rayleigh modes in surfaces loaded with deposited strips of different materials. General expressions are obtained for the number of modes and cutoff conditions in these structures. As examples of applications, a simple directional coupler and an electrically controlled coupler are proposed.<>

Keywords

acoustic waveguides; surface acoustic wave devices; Rayleigh modes; SAW; acoustical modes; cut-off conditions; directional coupler; multichannel surface-acoustic-waveguide structures; Acoustic propagation; Acoustic waves; Modal analysis; Optical devices; Optical modulation; Optical propagation; Optical surface waves; Optical waveguides; Surface acoustic wave devices; Surface acoustic waves;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.4188

Filename

4188